LEASES - Net Value of Leased Assets (Details)	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)
Sale Leaseback Transaction [Line Items]
Equipment	¥ 15,611,103,021		¥ 12,899,352,492
Less: accumulated depreciation	(3,863,719,503)		(3,497,199,736)
Net Value	12,455,443,559	$ 1,908,880,239	10,208,204,549
Leased Assets [Member]
Sale Leaseback Transaction [Line Items]
Equipment	1,072,214,761		1,510,944,643
Less: accumulated depreciation	(243,092,569)		(251,231,428)
Net Value	¥ 829,122,192		¥ 1,259,713,215

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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